The way I see it is that a reviewer/beta/whatever isn't grading me or judging me - they are adding their perspective and knowledge and experience to help me make my story better, and I WANT my story to be better. Getting mad at them after they took the time to help me, or wanting them to hold back and not help as much as they can, is just stupid and a waste of everyone's time. They don't make comments to be mean, they make them to *help* and, yes, some comments are easier to take than others depending on wording, but all of them are useful if the reviewer is doing his/her job.